Refrigerating apparatus



Deli 4- c. F HENN EiY 1,985,252

- REFRIGERATING APPARATUS I Original Filed Aug. 30 1950 2 Sheets-Sheet lINVENTOR I ATT RNEU A Dec. 25, 1934'. v c. F. HENNEY REFRIGERATINGAPPARATUS v Original Fi led Aug. -30, 1930 2 Sheets-Sheet 7 I a z Erw112 I53 161 INV TOR IR TORNEYS metathesi I 1,985,252

v jusszsz ammosasrmo msas'rus Charles I. Henney, Dayton. Ohio, asslgnorto Frigidaire Corporation, Dayton, Ohio, a corporation of DelawareApplication August so. 1030. Serial No. 418,91;

I Renewed March 11, 19:4

4 cisimsf (cl. sz-us) This invention relates to refrigerating appavidedabove the main part of the cabinet in which ratus and more particularlyto that type of apis keptthe various syrups and flavors. Under paratusin which at least two evaporators are ordinary circumstances, it isgenerally desired to maintained at diflerent temperatures, or are somaintain the compartment at approximately is operated as to producedifferent temperatures in 34 F., the compartment 11 at approximately 405 refrigerated spaces. F., the compartment 12 at temperatures ranging Anobject of-this invention is to provide a refrom approximately 0 1". to10 F., while the frigerating apparatus of the character abovedecompartment 13- is generally maintained at apk scribed in whichoperating eiiiciency is increased. proximately 50' F. 10 Further objectsand advantages of the present Sometimes the compartment 12 is withinitseli 10 invention will be apparent from the following deprovided withdiii'erent temperatures, and, in this scription, reference being had tothe accompanye instance, it 'may be accomplished by providing ingdrawings, wherein a preferred form of the a partition 14 so that thebrine on the left side present invention is clearly shown. may bemaintained at 0 F. while the brine on 15 In the drawings: the right handside may be maintained at apl5 Fig. 1 is a vertical cross-sectionalview, someproximately 7 1. j v

what tic of an apparatus embodying In order to refrigerate the sodafountain, a features of this invention; 7 refrigerant liquefying unit isprovided which Fig. 2 is a vertical cross-sectional view, someisconnected by means 'of a liquid'refrigerant line 20 what tic ofa'modifled form of the 21 with the evaporators hereinafter to be de- 20invention; scribed and by the evaporated refrigerant line Fig. 3 is ahorizontal cross-sectional view of the 22 which receives the refrigerantevaporated in UNITED STATES- PATENTOFFICE apparatus shown in Fig. 2:andthe evaporators and returns the same" to the unit Fig. 4 is adiagrammatic illustration of amodi- 20. The unit 20 may be of thecompressor-con- 2s ned form of the invention. denser type, if desired,and thus includes a com- 25 I In an app r u wherein two evaporators havepressor 2a, a condenser 24, receiver 25, the latbeen connected to asingle refriger n liquefyter being connected to the liquid refrigerantline ing unit it has been customary to" provide means 2L The compressor'is operated by a motor 26 whereby diflerent temperatures'may beobtained which is started and stopped by means of a snap 80 from thediflerent evaporators. However, it has switch 2'! operated by thebellows 28 in a, m n- 30 s ner l r 119008881! to p te h ner hereinafterto be more fully described. r n qu fv s u in such a manner that sub- Thesoda fountain is provided with a plurality mt a a of the liqu vins prati ns hav of evaporators, and thus includes a high p been 0811194 011with 8 7 low back Pressure, sure evaporator 30, partly in thecompartment 10 86 such back pressure usually corresponding to the andpartly in the compartment 13, and a low Pressure M inthe l west tempertur pressure evaporator 31 partly-lathe compartment evaporator.According to this invention, bowis and paitly in the compartment 12. Anexv r. i ilm to operate the high. mp mpansion valve 32 connects the line21 with the tun mm evaporators at back pressures evaporator 30 and anexpansion valve 33 con- 4 corresponding to their temperatures and toop-' nects the'evaporator 81 with the line 21. These 4 40 mi e 1 l w bak PW 0111! wh mravalves are automatically controlled and are so artionis required in the low pressure evaporator ranged as to prevent flow ofrefrigerant into the or evaporators. evaporators at predetermined highpressure lim- Intbe apparatus-shown in Fig, i, as a specific itsrespectively and automatically open when the refrigerating means. Thesoda fountain, as here determined limits. ,I'hus the valve 32automatishown,includesa c abinethavinginsulatedoutercallyopenswhenthepressurewithintheevaposide,bottomandtopwailsandcontaininga comrator 30fsllstoapressurecorrespondingto34 F. partment 10for cooling drinking water, carbonwhich with S0: is approximatelyflpounds. The ated water and the like: a compartment. 11 for valve 38automaticailyopens at a pressure correa cooling bottleddrinks and thelike and a comsponding with 0' I. which with so, is 14 inchespartmentHfOreoolingicecreama'ndothervacuM 1 foods requiring relativelylow temperatures. The expansion valve 1 82 is provided with a also aninsulated syrup rail or thermostatic controls! for closing said valvediagrammatieallyindicateda't 13,'isgenerallypr0- when a p lowtemperature has been embodiment, a soda folmtain is provided withpress'uresin theevaporators drop below saidpre- 45 2 reached at acertain point in the high pressure evaporator. In this particularinstance, the thermostatic control includes a bulb 35 connected to thevalve 32 and is adapted to close the said valve when that portion of theevaporator 30 the evaporator 30 at the point shown immediately above thelevel 36 of the liquid in the compartment, so that the bulb is notcooled to the pre- I determined temperature until the liquid incornpartment 10 reaches that temperature.

The compartment 10 is filled with water or some liquid of similarfreezing temperature and .one or more coils 3'7 are placed in thecompart- Y vice may, if desired, be omitted with the type of' ment 10through which drinking water, carbonated water and the like flows and iscooled by the liquid in the compartment 10 which liquid in turn iscooled by the submerged cofls 30a of the evapo- 1 rater 30. I

The evaporator 30 continues in the form of a pipe 30b through the syruprail 13 to a second valve 39. This valve preferably is of the snapacting type and is adapted to snap shut when the pressure in theevaporator 30 falls below a predetermined pressure,- said pressure,being below the pressure at which the valve 32 opens when not closed bythe thermostatic control 34. The snap acting mechanism of the valve 39is made responsive to the pressure within the evaporator 30,

for instance for diagrammatic showing, through the tube 40. Atype ofvalve suitable for valve 39 is disclosed in the application of GilbertH.-

Williams, Serial No. 351,363, filed March 30,1929. The valve 33 is setto open and close at pressures which SSO: would be 12 pounds and 0pounds respectively. The evaporator 31 has a valve 33 similar to thevalve 32, also provided with a thermostatic device 41, although. thisthermostatic demotor control shown in Figs. 1 to 3 inclusive. Thethermostatic device 41 includes a bulb 42 connected to the outlet endof-the pipe which terminates the evaporator 31 and is connected to thevalve 33 to close the same when the bulb 42- reaches a predetermined lowtemperature. The evaporator 31 is also provided with a check valve 43connecting the low pressure evaporator 31 with the evaporatedrefrigerant line 22. The check valve 43 is so arranged that it permitsfiow of the refrigerant from the evaporator 31 to'the line 22' butprevents the flow from the line 22 to the evaporator 31.

' Provisions for causing the refrigerant liquefye ing unit to operate inaccordance with certain conditions in the evaporators is provided.Pref-- erably the unit 20 is controlled by condensation, before returnto the unit, of refrigerant evaporated in the high pressure evaporator30.] Thus a heat exchanging device 44 is constructed in the form of adownwardly directed loop in a pipe fromthe valve 39. This loop is inheat exchange relation to the evaporator 31. Control'means responsive tothe device 44 is provided for controlling'the operation of theregfrigerant liquefying unit 20 and this includes a thermostatic bulb 45adjacent the loop 44, the bulb 45 being connected by means of the pipe46 with thebellows which operates the snap switch 27 which controls themotor. 26. when the valve 39 opens, evaporated refrigerant through theexchange device 44 and is-there condensed by reason of the a backpressure equal to the pressure at which the valve 32 is set to open.Refrigeration continues at this back pressure until such a time as thecoil 30a adjacent the bulb 35 is cooled sumciently to close the valve 32by the action of the bulb 35. when the valve 32 is closed the compressorquickly pulls the pressure of the evaporator 30 down to such a pressurethat itwill cause the valve 39 to snap shut. When this happens thecompressor 23 quickly pulls down the pressure in the line 22 to thepoint where valve 33 is opened permitting refrigerant to flow throughthe evaporator 31. run until such a time as, the brine in thecompartment 12 is cooled suflici'ently 'to cause the bulb 45 to open theswitch .27 and stop the com-' forms two-thirds of the work at the higherback pressure required in the evaporator '30. Since the difference inback pressure between the evaporators 30. and 31 is quite large, asubstantial saving in operating cost is possible.

The evaporator 31 may also be used to aid in the cooling of the syruprail 13., This is accomplishedby providing a few bends of coil 31a inthe syrup rail before passing the pipe comprising the evaporator 31 intheform of coi1s 3lb and 31c around the sleeves in thewompartment 12.

The compartment 12 in this particular embodiment includes a brine tankand a plurality 'of sleeves 51, 52 and 53. The refrigerant after passThe corresponding parts of the refrigerating sys-' tern are similarlynumbered in these figures, with the exception that has been added to the-numbers. Thus the liquid refrigerant line 121 in Fig.2 corresponds tothe liquid refrigerant line,

21 in Fig. 1, the same being true with respect to all othercorresponding numbers.

Inthe modification shown in Figs. 2 and 3 the sleeve 151, instead ofbeing submerged in a brine tank, is encasedin a concrete casing 160. Alarge substantially square sleeve 152,153 is encased in' 16 requiresrefrigerant in the evaporator 30 and operates at The compressorthencontinues to pressor 23. In this system the' compressor peraconcrete casing 161 and is provided witha con Y trol metal plate todivide it into sub-compartments and to provide-for conduction of heat.The casings 160 and 161 'are placed around the sleeves after the cofls1315 and 1310 have placed around the sleeves 151, 152-153 respectively.The concrete is preferably quick drying' Portland cement used withoutany sand or other ingredients except water. If desired. the cofls 1315and 131c may be'made of copper tubing with fins attached thereto. Thefins if desired may be a continuous spiral strip wound around the pipe;The cement is dried after it has set. 1 The loop 144 together with thebulb 145 is placed immediately outside the sleeve 151 and is alsoembedded in the concrete sleeve 160.

The casings and 161 rest on the cork board bottom 163 and are spacedfrom each other by a slab or cork 164. A second slab of cork is placedontheothersideofthecasinglw "after which loose ground cork 166 ispouredbetween the slabs of cork and the casings 180 and 161. In thesemodifications the compressing unit preferably is identical with thatshown in Fig. 1.

Fig. '4 shows how either of the modifications shown in Fig. 1 or inFigs. 2 and 3 may be provided with a slightly'diiferent motor control.Thus the refrigerant liouefying unit 220 may correspond in Fig. 1, itbeing understood that sleeves are placed within some of the coils andthat another coil is submerged in liquid corresponding to compartment10. The details of the cabinet have been omitted in Fig. 4 in order toshow more clearly the refrigerating system. V

The system shown in Fig. 4, is further modified with respect to thesystem shown in Fig. 1 by providing a "low pressure" control for therefrigerant liquefying unit 220. Thus the loop 44 and bulb-i5 have beenomitted in Fig.4 and inlieu thereof the bulb 228 is actuated by thepressure in the evaporated refrigerant line 222, the bulb 228 merelybeing connected by a pipe 271 with the line 222, to be responsive to thepressure in the low side of the system.

While the form of embodiment of the invention as herein disclosed,constitutes a preferred CERTIFICATE OF Patent No. 98 5: 5

I CHARLES F. Harm.

and means for preventing the fiow of gaseous refrigerant from saidevaporator to the other evaporators when said last named means permitsthe fiow of refrigerant fromsaid evaporator to the exhaust conduit.

2. Refrigerating apparatus comprising, in combination, a pair ofevaporators connected in parallel circuit relation: a common exhaustconduit connected to outlets of said evaporators; means for withdrawinggaseous refrigerant from the exhaust conduit, liquefying the refrigerantand returring the liquid to the evaporators; means for permittingandpreventing the fiow of refrigerant from the outlet of one of saidevaporators to the common exhaust conduit; and a check valve connectedbetween the outlet of the other evaporator and the exhaust conduit toprevent fiow from the exhaust conduit to said other evaporator.

3. Refrigerating apparatus comprising, in combination a pair ofevaporators connected in parallel circuit relation; a common exhaustconduit connected to outlets of said evaporators; means for withdrawinggaseous refrigerant from the exhaust conduit, liquefying the refrigerantand returning the liquid 'to the evaporators; means responsive to thepressure of one of the evaporators for fully opening and positivelyclosing its outlet to the exhaust conduit; and a check valve disposedbetween the outlet of the other evaporator and the exhaust conduit toprevent fiow from thelexhaust conduit to said other evaporator.

4. Refrigerating apparatus comprising, in comtor and the exhaust conduitto prevent fiow from the exhaust conduit to said other evaporator; andmeans responsive to pressure of the exhaust conduit for starting andstopping the liquefying means. I CHARLES r. CORRECTION.

December 25, 19 b,.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correotionas follows: Page 2,first column, line 37,. for "which SSO 'Y read whichwith S0 and that thesaid Letters Patent should be read with this correction therein that thesame may conform to the record of .the case in the Patent Office.

' Signed and sealedthis 25th day of July, A. n. 19 9.

(Seal) 7' Henry Van Arsdale, Acting Commissioner of Patents.

which loose ground cork 166 ispoured between the slabs of cork and thecasings 180 and 161. In these modifications the compressing unitpreferably is identical with that shown in Fig. 1.

Fig. '4 shows how either of the modifications shown in Fig. 1 or inFigs. 2 and 3 may be provided with a slightly'diiferent motor control.Thus the refrigerant liouefying unit 220 may correspond in Fig. 1, itbeing understood that sleeves are placed within some of the coils andthat another coil is submerged in liquid corresponding to compartment10. The details of the cabinet have been omitted in Fig. 4 in order toshow more clearly the refrigerating system. V

The system shown in Fig. 4, is further modified with respect to thesystem shown in Fig. 1 by providing a "low pressure" control for therefrigerant liquefying unit 220. Thus the loop 44 and bulb-i5 have beenomitted in Fig.4 and inlieu thereof the bulb 228 is actuated by thepressure in the evaporated refrigerant line 222, the bulb 228 merelybeing connected by a pipe 271 with the line 222, to be responsive to thepressure in the low side of the system.

While the form of embodiment of the invention as herein disclosed,constitutes a preferred CERTIFICATE OF Patent No. 98 5: 5

I CHARLES F. Harm.

and means for preventing the fiow of gaseous refrigerant from saidevaporator to the other evaporators when said last named means permitsthe fiow of refrigerant fromsaid evaporator to the exhaust conduit.

2. Refrigerating apparatus comprising, in combination, a pair ofevaporators connected in parallel circuit relation: a common exhaustconduit connected to outlets of said evaporators; means for withdrawinggaseous refrigerant from the exhaust conduit, liquefying the refrigerantand returring the liquid to the evaporators; means for permittingandpreventing the fiow of refrigerant from the outlet of one of saidevaporators to the common exhaust conduit; and a check valve connectedbetween the outlet of the other evaporator and the exhaust conduit toprevent fiow from the exhaust conduit to said other evaporator.

3. Refrigerating apparatus comprising, in combination a pair ofevaporators connected in parallel circuit relation; a common exhaustconduit connected to outlets of said evaporators; means for withdrawinggaseous refrigerant from the exhaust conduit, liquefying the refrigerantand returning the liquid 'to the evaporators; means responsive to thepressure of one of the evaporators for fully opening and positivelyclosing its outlet to the exhaust conduit; and a check valve disposedbetween the outlet of the other evaporator and the exhaust conduit toprevent fiow from thelexhaust conduit to said other evaporator.

4. Refrigerating apparatus comprising, in comtor and the exhaust conduitto prevent fiow from the exhaust conduit to said other evaporator; andmeans responsive to pressure of the exhaust conduit for starting andstopping the liquefying means. I CHARLES r. CORRECTION.

December 25, 19 b,.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correotionas follows: Page 2,first column, line 37,. for "which SSO 'Y read whichwith S0 and that thesaid Letters Patent should be read with this correction therein that thesame may conform to the record of .the case in the Patent Office.

' Signed and sealedthis 25th day of July, A. n. 19 9.

(Seal) 7' Henry Van Arsdale, Acting Commissioner of Patents.

